Empirical Calculation and Actual Measurement Verification of the"Two Belts"Development Height in the Stope
In view of the overlying roof of the 42211 fully mechanized mining face in Haiwan Coal Mine and the remaining 3-1 coal goaf in other mines,it may affect the normal production activities of this working face,it is necessary to accurately explore the range of the development height of the"two belts"of the stope overlying roof in this area,so as to explore and effectively prevent and govern hidden disaster causing factors of the roof.Taking the 42211 working face as an example,through the comparison and mutual authentication of the measured data obtained from the"two belts"development height derived from the empirical formula and the downhole oblique drilling observation device,a relatively close result is finally obtained.This indicates that the use of the downhole oblique drilling observation method can obtain accurate data on the development height of the"two belts"in the working face,providing a feasibility study method for measuring the development height of the"two belts"in similar working faces.
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